Locomotive cylinder structure



June 26, 1934. A. H. FETTERS LOCOMOTIVE CYLINDER STRUCTURE Filed Dec. 12. 1952 //7 van for Ar/bz/r Fe f/era vii/ 7 W lfllllfllllIllllll Patented June 26, 1934 UNiTED STATES PATENT FlE LOCOMGTIVE CYLINDER STRUCTURE Application December 12, 1932, Serial No. 646,783

9 Claims.

This invention relates to railway rolling stock and consists in novel cylinder saddle construc tion.

It is the usual practice in locomotive construc tion to cast the main steam cylinders with a saddle part, either forming a portion of the underframe or arranged for attachment thereto, steam control chambers, and steam passages extending between the cylinders and chambers and the chambers and cylinder saddle. The main steam cylinders are desirably bushed for receiving operating pistons and for this purpose the cast cylinders are reamed and the bushings pressed into position. This construction, due to the double thickness of the finished cylinder wall, is heavier than is necessary to withstand the steam pressure.

One object of the present invention is to d crease the weight of the main steam cylinders by substantially eliminating the duplication referred to in the finished cylinder wall.

Another object is to simplify the construction of the steam cylinders by eliminating the necessity of reaming the extensive inner surfaces of the cast walls preparatory to the insertion of bushings.

These objects and others hereafter appearing are attained substantially by the structures illustrated in the accompanying drawing in which Figure 1 is a vertical section taken on the transverse center line of the cylinder saddle structure illustrating the invention.

Figures 2 and 3 are substantially horizontal sections taken on the corresponding section lines of Figure 1.

Figure 4 is in part a side view and in part a vertical longitudinal section taken on the line 4-4 of Figure 3.

Figure 5 is a detail section corresponding to Figure 1 but illustrating a modification.

Figure 6 is a section taken on the broken line 66 of Figure 5.

In Figures 1 to 4, the invention is illustrated as applied to a cast locomotive underframe structure comprising a central box-shaped cylinder saddle part including vertical side walls 1 and horizontal bottom web 2 having a center plate mounting 25, and top web 12 above which projects a smoke box support including longitudinal walls 3, transverse walls 22, and an arcuate saddle i. The saddle is formed integral with the main body of the underframe, the walls 1 and 2 of the saddle forming continuations of the corresponding underframe walls. At the sides of the smoke box support and above the web 12 and the box-shaped saddle part are the usual steam control valve chambers 5 each having a central live steam inlet 6 and exhaust passages 7 extending from the ends thereof diagonally inwardly through the smoke box support and merging in a nozzle 8 leading upwardly into the smoke box (not shown). Each chamber is further braced by means of a web 14 merging with the upper walls of passages 7 and with the smoke box support.

Beneath the chamber 5 at each side are longitudinally spaced vertical rings 9 partially supported from the chamber by means of steam passages 10 which open through the rings. Merging with the under surfaces of exhaust passages 7 is a web 27 having a vertical flange 11, the web curving downwardly at the ends and merging with the rings 9 and in the middle merging with the box-shaped saddle adjacent the top web 12. The rings are connected to the lower part of the saddle by means of a horizontal web 13 having vertical end flanges 25. Webs 14, 27 and 13 are cored out between the passages '7 and the rings 9 to facilitate access to the inner parts of the casting for inspection and repair purposes.

The main steam cylinder proper is formed by a cylindrical bushing 15 inserted in the rings and welded thereto, as at 16. This bushing is conveniently formed of a piece of boiler plate rolled into a cylinder and welded along the longitudinal seam 17. The outer surface of each ring 9 is provided with a collar 18 which is machined and perforated for receiving studs 23 for attachment of cylinder head 24, shown in broken lines in Figure 4.

The form in Figures 5 and 6 corresponds to that in the previous form except that the boxshaped saddle is provided with depending longitudinal webs 19 perforated for receiving bolts 20 for attachment of the cylinder saddle to separate underframe longitudinals 21.

The practice of the present invention substantially decreases the weight of the cylinder saddle, which feature is particularly advantageous at present in view of the tendency of locomotive builders to increase boiler capacity wherever a saving in weight can be effected in other locomotive parts.

The interior of the bushing is preferably ground smooth for receiving the steam piston. This operation is not as difiicult as the reaming formerly necessary to prepare the cast cylinder walls for the insertion of a bushing. Where the bushing is made of hard material, such as nickel steel boiler plate, wear on the part will be negligible. However, in case it is desired to replace the bushing, the same can be readily removed from the rings. The exterior of the bushing is exposed substantially throughout its length and circumference, facilitating the application of lagging thereto.

Obviously the invention may be applied to other cylinder structures and the arrangement of various adjacent parts may be modified as desired. I contemplate the exclusive use of all such modifications as come within the scope of the appended claims.

What is claimed is:

1. In combination, a locomotive cylinder saddle structure including outwardly projecting rings spaced apart, and a separately formed piston receiving cylinder with its end portions secured to said rings and with its exterior surface intermediate said portions exposed from ring to ring throughout the periphery of the cylinder.

2. In combination, a locomotive cylinder saddle casting with integral rings projecting laterally therefrom and spaced apart, and a separately formed main steam cylinder secured to said rings and forming the sole direct connection between them.

3. In combination, a locomotive cylinder saddle structure including an intermediate part and rings projecting sidewardly therefrom and rigid therewith, and a separately formed cylinder member secured in said rings and solely supported thereby.

4. In combination, a locomotive cylinder saddle structure including longitudinally-spaced outwardly projecting rings free of direct connection with each other, there being rigid supports between said rings and said structure, and a separately formed main steam cylinder member with its end portions secured in said rings, the remaining portions of said member being disconnected from said supports and said saddle structure.

5. A locomotive cylinder saddle structure including an intermediate part, spaced rings rigid therewith and arranged for mounting cylinder heads, and a separately formed cylindrical member of single radial thickness secured at its end portions in said rings and forming the inner and outer walls of a main steam cylinder.

6. A locomotive cylinder saddle integral structure including an underframe part, a valve cham ber disposed sidewardly thereof, and longitudinally spaced rings depending from said chamber, there being steam ports in said rings and passages extending therefrom to said chamber, and a separately formed cylindrical member secured in said rings and forming a main steam cylinder.

'7. A locomotive underframe structure including a cylinder saddle part, a steam control chamber at the side thereof, longitudinally spaced rings beneath said chamber, steam passages connecting said chamber and said saddle part, other steam passages extending from said chamber and opening through said rings and serving as supports for said rings, and a separately formed bushing secured to said rings and forming a piston receiving cylinder.

8. In combination, a locomotive integral cast metal underframe structure including a cylinder saddle part and vertical rings at the side thereof, and a separately formed bushing welded to said rings and alone forming a piston receiving main steam cylinder therewith.

9. A locomotive cylinder saddle structure including an underframe part and longitudinally spaced rings disposed sidewardly thereof, steam ports in said rings, said rings being arranged for insertion of a steam cylinder therethrough, and elements on said rings for attaching cylinder heads.

ARTHUR H. FETTERS. 

